there is growing concern within the obama administration that the assad regime in syria may resort to chemical weapons in its ongoing fight with 9 rebels. in fact, secretary of state hillary clinton issued a stern warning this morning calling the potential use of such weapons a red line for the united states. >> in fact, one administration official told cnn there are, quote, worrying signs of activity in syria, just in the past couple of days. pentagon correspondent barbara star, we're so happy to thank, is with us in studio this morning. barbara, great to see you. so the white house apparently hasn't revealed any new evidence that the syrian government is planning to deploy these weapons. >> what are we talking about here? they're not revealing it publicly but in fact there has been intelligence over the last couple of days that the syrians are moving their chemical weapons inventory around. and it's quite different. in the past we've seen them moving it around to store it essentially, make it more secure, as fighting's gotten closer. this time all of our sources are telling us, it i